MaThCryst forthcoming activities


Symmetry and Crystallography in Turkish Art and Culture, ECM25 Satellite, August 2009, Istanbul (Turkey)


Chirality and achirality in crystallography

by H. D. Flack, Laboratoire de Cristallographie, Université de Genève, Switzerland.

Participants at the school were provided with a colour printout of the slides used. These can not be reproduced here because some of the material is copyright. However in the following publications, one can find all of the necessary information:

Chiral and Achiral Crystal Structures. H. D. Flack (2003). Helvetica Chimica Acta 86, 905-921. [ E-Reprint Copyright © Helvetica Chimica Acta]

Absolute structure and absolute configuration. H. D. Flack and G. Bernardinelli (1999). Acta Cryst. A55, 908-915. [ E-Reprint Copyright © International Union of Crystallography ]

Reporting and evaluating absolute-structure and absolute-configuration determinations. H. D. Flack and G. Bernardinelli (2000). J. Appl. Cryst. 33, 1143-1148. [ E-Reprint and Supplementary Material Copyright © International Union of Crystallography]

The Mirror of Galadriel: looking at chiral and achiral crystal structures. H. D. Flack and G. Bernardinelli (2003). Crystal Engineering, 6, 213-223. [E-Reprint Copyright © 2004 Elsevier Ltd.]

Anti-wurtzite reoriented. M. Hostettler and H. D. Flack (2003). Acta Cryst. B59, 537 - 538. [E-Reprint Copyright © International Union of Crystallography]

Exercises

Participants were provided with printed copies of the following five papers and asked to comment on them. For reasons of copyright the articles themselves can not be copied here but stable links by way of DOI's are provided.

L-Valinium hydrogenphosphite. L. Bendheif, N. Benali-Cherif, L. Benguedouar, K. Bouchouit and H. Merazig (2003). Acta Cryst. E59, o141 - o142.

Absolute Configuration of (+)-α-Dihydrotetrabenazine, an Active Metabolite of Tetrabenazine. M. R. Kilbourn, L. C. Lee, M. J. Heeg, and D. M. Jewett (1997). Chirality 9, 59 – 62.

Mn1-xFexS, x ~ 0.05, an example of an anti-wurtzite structure. L. Eriksson and M. P. Kalinowski (2001). Acta Cryst. E57, i92 - i93.

(Rs )-4-p-Toluenesulfinylcyclohexa-l,4-dienecarboxylic Acid Ethyl Ester. R. Retoux, J. Molenkamp, E. Bonfand P. Gosselin and C. Maignan (1996). Acta Cryst. C52, 2290 - 2292.

The ‘absolute structure’ of dimethyldiphenylphosphonium iodide. F, Dornhaus, H.-W. Lerner and M. Bolte (2005). Acta Cryst. E61, o1657 – o1658.

The participants worked in small groups and it was encouraging to see that was a good deal of interaction between people with training in chemistry, physics, mathematics and materials science. All of these papers have certain negative aspects to them. For a future effort I would include some which would require only positive comments.


4th July 2005